Who is to blame.

[vorlon13]

Do we blame Trump for internal democrat polling that missed 10,000,000 democrats that voted for Obama who were going to sit out the 2016 election ?

This is a myth. I mean yeah, in 2008, there were a lot more votes.  BUT in 2012, Obama gained approx the same total number of voters as Hillary just did.  As a matter of fact, current totals show she OUTPERFORMED his 2012 total votes.
She underperformed in a few key states only.

While she underperformed relative to Obama’s 2012 totals in several Midwestern states — Ohio, Michigan, Iowa, and Wisconsin — Clinton ran virtually even with Obama in the battlegrounds of Pennsylvania, North Carolina, Virginia, Nevada, and New Hampshire. What’s more, she far surpassed Obama’s 2012 vote total in Florida, the country’s biggest swing state. Yet somehow, while Obama carried Florida, Clinton lost it. 

Read more at: http://www.nationalreview.com/corner/442...obama-2012

Hillary Clinton (2016) 64,654,483 total votes
Barack Obama (2012) 62,615,406 total votes

Trump gained votes on Romney.
Mitt Romney (2012) 59,142,004 total votes
Donald Trump (2016) 62,418,820 total votes

(P.S. it appears Obama would have barely edged out Trump in 2012, because of a few battleground states, but it would have been VERY close.  Trump overperformed massively, Clinton did not actually under perform at all. )

P.P.S. So please stop spreading the myth of 10 million missing democratic voters.  Thanks.

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Also, I just looked and Obama got Obama's total vote amount of 69.5 million votes in 2008, a difference of approx 5 million.  So even if you are counting from the UNPRECEDENTED election of 2008, it's 5 million, not 10.

I got the 10,000,000 figure from this, I didn't make it up.